@Jens, In that case (no contact yet), you could maybe say:
I have been thinking maybe you no longer want to write me because of the pic?!
I won't send pics anymore.
I made a mistake above in #2. I used two "maybes". Just use 1!
I thought maybe you didn't want to write me anymore because of the pic?! I won't send pics anymore.
That would be in the case where she finally sent a note, and you are responding.
@tomtom, Hmmm. Not 100% sure! In your suggestion, I'd use "anymore" in the first part:
I thought you didn't want to write (to) me anymore, maybe because of the photo (?)
since I think it means "weiterhin", the adverb.
In the second part:
Well, I won't send any more photos.
it makes sense to me as two words, before "photos", since it modifies "photos", as an adjective.
I placed it afterwards "... send pics anymore." where I think it means "weiterhin" again, modifying "send", as an adverb.
That's how I understand it! Good question. I hope I understood your question, answered it, and made sense.
I certainly make mistakes.